"""
C++ 引擎示例代码（占位实现）

实际使用时需要编译为动态库：
- Windows: .dll
- Linux: .so
- macOS: .dylib

编译命令示例：
g++ -shared -fPIC -o libmi_engine.so cpp_engine_example.cpp
"""

# 以下是C++接口定义（伪代码）

"""
// cpp_engine.h
#ifndef MI_CPP_ENGINE_H
#define MI_CPP_ENGINE_H

#include <cstdint>

extern "C" {

// 事件结构体
struct TraceEventC {
    double timestamp;
    int32_t thread_id;
    int32_t process_id;
    double duration;
};

// 统计结果
struct MetricsResult {
    int32_t count;
    double mean;
    double std_dev;
    double min_val;
    double max_val;
};

// 处理事件数组
void process_events(TraceEventC* events, int32_t count, TraceEventC* output);

// 聚合指标
MetricsResult aggregate_metrics(double* data, int32_t count);

// 批量转换
void batch_transform(TraceEventC* events, int32_t count, double* output);

}  // extern "C"

#endif  // MI_CPP_ENGINE_H
"""

"""
// cpp_engine.cpp
#include "cpp_engine.h"
#include <algorithm>
#include <cmath>
#include <numeric>

extern "C" {

void process_events(TraceEventC* events, int32_t count, TraceEventC* output) {
    // 高性能事件处理逻辑
    for (int32_t i = 0; i < count; ++i) {
        output[i] = events[i];
        // 在这里添加你的处理逻辑
        // 例如：过滤、转换、聚合等
    }
}

MetricsResult aggregate_metrics(double* data, int32_t count) {
    MetricsResult result = {0};
    
    if (count == 0) {
        return result;
    }
    
    result.count = count;
    
    // 计算均值
    double sum = std::accumulate(data, data + count, 0.0);
    result.mean = sum / count;
    
    // 计算标准差
    double sq_sum = 0.0;
    for (int32_t i = 0; i < count; ++i) {
        double diff = data[i] - result.mean;
        sq_sum += diff * diff;
    }
    result.std_dev = std::sqrt(sq_sum / count);
    
    // 最小/最大值
    result.min_val = *std::min_element(data, data + count);
    result.max_val = *std::max_element(data, data + count);
    
    return result;
}

void batch_transform(TraceEventC* events, int32_t count, double* output) {
    // 批量转换示例：提取持续时间
    for (int32_t i = 0; i < count; ++i) {
        output[i] = events[i].duration;
    }
}

}  // extern "C"
"""

# 编译说明
COMPILE_INSTRUCTIONS = """
# Windows (MSVC)
cl /LD cpp_engine.cpp /Fe:mi_engine.dll

# Windows (MinGW)
g++ -shared -o mi_engine.dll cpp_engine.cpp

# Linux
g++ -shared -fPIC -o libmi_engine.so cpp_engine.cpp

# macOS
g++ -shared -fPIC -o libmi_engine.dylib cpp_engine.cpp

# 优化编译
g++ -O3 -march=native -shared -fPIC -o libmi_engine.so cpp_engine.cpp
"""

if __name__ == '__main__':
    print("C++ Engine Example")
    print("=" * 60)
    print(COMPILE_INSTRUCTIONS)
